整理した

src/client/app/desktop/views/components/ui.header.nav.vue

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+<template>
+<div class="nav">
+	<ul>
+		<template v-if="os.isSignedIn">
+			<li class="home" :class="{ active: $route.name == 'index' }">
+				<router-link to="/">
+					%fa:home%
+					<p>%i18n:desktop.tags.mk-ui-header-nav.home%</p>
+				</router-link>
+			</li>
+			<li class="messaging">
+				<a @click="messaging">
+					%fa:comments%
+					<p>%i18n:desktop.tags.mk-ui-header-nav.messaging%</p>
+					<template v-if="hasUnreadMessagingMessages">%fa:circle%</template>
+				</a>
+			</li>
+			<li class="game">
+				<a @click="game">
+					%fa:gamepad%
+					<p>ゲーム</p>
+					<template v-if="hasGameInvitations">%fa:circle%</template>
+				</a>
+			</li>
+		</template>
+		<li class="ch">
+			<a :href="chUrl" target="_blank">
+				%fa:tv%
+				<p>%i18n:desktop.tags.mk-ui-header-nav.ch%</p>
+			</a>
+		</li>
+	</ul>
+</div>
+</template>
+
+<script lang="ts">
+import Vue from 'vue';
+import { chUrl } from '../../../config';
+import MkMessagingWindow from './messaging-window.vue';
+import MkGameWindow from './game-window.vue';
+
+export default Vue.extend({
+	data() {
+		return {
+			hasUnreadMessagingMessages: false,
+			hasGameInvitations: false,
+			connection: null,
+			connectionId: null,
+			chUrl
+		};
+	},
+	mounted() {
+		if ((this as any).os.isSignedIn) {
+			this.connection = (this as any).os.stream.getConnection();
+			this.connectionId = (this as any).os.stream.use();
+
+			this.connection.on('read_all_messaging_messages', this.onReadAllMessagingMessages);
+			this.connection.on('unread_messaging_message', this.onUnreadMessagingMessage);
+			this.connection.on('othello_invited', this.onOthelloInvited);
+			this.connection.on('othello_no_invites', this.onOthelloNoInvites);
+
+			// Fetch count of unread messaging messages
+			(this as any).api('messaging/unread').then(res => {
+				if (res.count > 0) {
+					this.hasUnreadMessagingMessages = true;
+				}
+			});
+		}
+	},
+	beforeDestroy() {
+		if ((this as any).os.isSignedIn) {
+			this.connection.off('read_all_messaging_messages', this.onReadAllMessagingMessages);
+			this.connection.off('unread_messaging_message', this.onUnreadMessagingMessage);
+			this.connection.off('othello_invited', this.onOthelloInvited);
+			this.connection.off('othello_no_invites', this.onOthelloNoInvites);
+			(this as any).os.stream.dispose(this.connectionId);
+		}
+	},
+	methods: {
+		onUnreadMessagingMessage() {
+			this.hasUnreadMessagingMessages = true;
+		},
+
+		onReadAllMessagingMessages() {
+			this.hasUnreadMessagingMessages = false;
+		},
+
+		onOthelloInvited() {
+			this.hasGameInvitations = true;
+		},
+
+		onOthelloNoInvites() {
+			this.hasGameInvitations = false;
+		},
+
+		messaging() {
+			(this as any).os.new(MkMessagingWindow);
+		},
+
+		game() {
+			(this as any).os.new(MkGameWindow);
+		}
+	}
+});
+</script>
+
+<style lang="stylus" scoped>
+@import '~const.styl'
+
+.nav
+	display inline-block
+	margin 0
+	padding 0
+	line-height 3rem
+	vertical-align top
+
+	> ul
+		display inline-block
+		margin 0
+		padding 0
+		vertical-align top
+		line-height 3rem
+		list-style none
+
+		> li
+			display inline-block
+			vertical-align top
+			height 48px
+			line-height 48px
+
+			&.active
+				> a
+					border-bottom solid 3px $theme-color
+
+			> a
+				display inline-block
+				z-index 1
+				height 100%
+				padding 0 24px
+				font-size 13px
+				font-variant small-caps
+				color #9eaba8
+				text-decoration none
+				transition none
+				cursor pointer
+
+				*
+					pointer-events none
+
+				&:hover
+					color darken(#9eaba8, 20%)
+					text-decoration none
+
+				> [data-fa]:first-child
+					margin-right 8px
+
+				> [data-fa]:last-child
+					margin-left 5px
+					font-size 10px
+					color $theme-color
+
+					@media (max-width 1100px)
+						margin-left -5px
+
+				> p
+					display inline
+					margin 0
+
+					@media (max-width 1100px)
+						display none
+
+				@media (max-width 700px)
+					padding 0 12px
+
+</style>